At the school I went to in the early 2010s the first-second graders used to play some educational (the kind that's not really explicitly educational as in it teaches kids but the kind that teachers approve of having technology class make them play) isometric point-and-click adventure game.
I remember there was a level with a minigame about bats in a place called "Spookane" (get it?) and a villain who I think looked like a donut. It was on PBS Kids, I'm pretty sure, and had a cartoony art style. The movement was by clicking on a grid on top of a background of a road. It was more the kind of point-and-click game where you move around and see things than the kind where you click on trash cans that do weird things like Putt-Putt.
There were about five chapters, and the last one needed you to make an account with a username and password.
I'm almost definitely sure it was connected to no specific TV show, but I didn't watch PBS Kids so it might have.
I looked at games tagged "adventure" on PBS Kids and didn't find it, so it maybe has been taken down.